Patent · US Expired

Method and device for driving a capacitive actuator

US6236190A · kind A · utility

15Cited by

9References

10Claims

0Family size

Assignee

Siemens Aktiengesellschaft · DE

Inventors

Christian Hoffmann · Leonberg, DE
Hellmut Freudenberg · Bad Abbach, DE
Hartmut Gerken · Nittendorf, DE

Key dates

Filing date	Apr 26, 1999
Grant date	May 22, 2001
Priority date	—
Expiry date	Apr 26, 2019

Classification

Technology area (CPC H)Electricity
CPC primaryH02N2/067
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

A constant displacement ds of a capacitive actuator, for instance a capacitor for a fuel injection valve of an internal combustion engine, is obtained within a wide temperature range. While the actuator is being charged, its current and the voltage across the actuator are multiplied with one another. The product of the current and the voltage are integrated and the integration value is compared with a predetermined setpoint value. The process of charging is interrupted when the integration value reaches or exceeds the actual value. In an alternative embodiment, the actuator is charged from a constant current source and only the voltage drop is integrated.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.